Lined conduit



Oct. 21, 1947. F. H. JANECEK ETAL LINED CONDUIT Filed Nov. 11, 1943 2Sheets-Sheet 1 lZa INVENTORS FEA Mr M JANEGEK LEONARD zAzsq/v Arzwe/vsrs Oct. 21, 1947. I F. H. JANECEK ETAL LINED CONDUIT Filed Nov.11, 1943 2 Sheets-Sheet 2 INVENTORS FRANK H- JA/VE'CE'K & ZEONAED ZAESONm w m T A Patented Oct. 21, 1 9 47 LINED CONDUIT Frank H. J anecek,Windham, and Leonard Larson, Shaker Heights, Ohio, assignors to RepublicSteelCorporation, Cleveland, Ohio, a corporation of New JerseyApplication November 11, 1943, Serial No. 509,862

2 Claims. (Cl. 13869) This invention relates generally to the art ofprotecting walls against abrasive wear and particularly to new andimproved means for protecting conduits of blast. furnaces against wearby the passage therethru of gases carrying fine abrasive solids.

Blast furnaces are equipped with conduits such as uptakes, bleeders,cross-heads and downcomers thru which highly heated gases carrying smallpieces of abrasive solids such as ore, coke and limestone, pass at highvelocities. These solids contact with and rapidly wear away the conduitsat various places, particularly at elbows and bends, and at other placeswhere gas currents sweep heavily against part of the surface of theconduit. Since the wear caused by the solids is not uniform in all partsof a conduit, certain parts of the conduit walls are worn away morerapidly than other parts and hence part of the conduit becomes uselesswhile other parts could be used for much longer periods of time.

Efforts have been made heretofore to protect the parts of such conduitswhich are subjected to the greatest wear but, so far as we are informed,none of those efforts has been entirely satisfactory. One proposal tosolve this problem was that of making large wear-resistant liner plates,for example, sections as large as four feet by six feet, arranging theplates in edge to edge contact, and securing the margins of the platesto the conduit by bolts, rivets or weld metal. This proposal wasunsatisfactory for several reasons. The conduit was subjected to varyingtemperatures on the outside, while the liner plates were maintained at ahigh temperature while the blast furnace was operating. The platesbuckled and warped due to changing temperatures and often damaged theconduits by bending springing or actually cracking or breaking theconduit, and-sometimes they tore loose from the conduit and slid downalong the conduit, often lodging at bends or elbows, thus partlyclogging or interfering with the operation of the at or near its middle.

In the drawings accompanying and forming a part of the specification,

Figure 1 is an elevational view of part of a blast furnace and dustcatcher with associated conduits including uptakes, bleeders,cross-heads and downcomers;

Figure 2 is a top plan view of the apparatus of Fig. 1; I

Figure 3 is a plan view showing a pluralityof liner plates of thisinvention assembled in a con-;

duit;

Figure 4 is an axial sectional view taken. on line 4-4 of Fig. 1 thruthe expansion joint thereof; and

Figure 5 is an enlarged sectional view taken" on line 55 of Fig. 4.

The blast furnace I of Figs. 1 and 2 is provided with four uptakeconduits 2 more orlessequally spaced around the top of the furnace.

It will be understood from Figs. land 2 that gases passing from furnaceI to dust catcher 6 will pass bends l in uptakes 2, will encounter arestriction 8 in bleeder 3, will make sharp turns in direction at}when-entering crossovers 4, will make other sharp turns and pass thrurestrictions ID in passing into downcomers 5, and will make turns orbends II in the latter before entering the-dust catcher 6. It will alsobe understood that in those restrictions and at those turns'and bends,much of the fine abrasive material carried by the gases will comeforcibly into contact with the surfaces of the conduit and-thattheresultant abrasive wear caused by the solid particles in the gases willbe greater at those points than elsewhere.

The uptakes 2, bleeders 3, cross-overs 4, and downcomers 5 are lined asis indicated in Fi 1. Preferably the uptakes 2, bleeders 3 andcrossovers 4 are lined thruout, while the upper ends of the downcomersand part of the remainder thereof are lined as indicated. If desired,the entire inner surface of each of these conduits may be lined.

In Fig. 3 a plurality of liner plates l2 are shown connected inassembled relation on the inner surface of a conduit. Each of theseplates has its edges 12a spaced 9. short distance from the ed es ofadjacent plates. At approximately its center each plate in place bysuitable attaching mean :pheric temperatures. .platesr'are such that theintervening space between, plates ;.can accommodate normal expansion:of'theplateathe tendency of theplates topress eachplate is attached tothe conduit in any suitable manner, for example, as by weld metal .13.

LIt will be understood that the plates need not be square orrectangular, as shown, for they may be about x10"- x /2", but, on thecontrary, may

@belarger. or smaller in length, width and thickness. Preferably, eachplate should not be so largethat when it expands under operatingtemperatures it will take up more than about onehalf of the spacebetween it and adjacent plates whichwas shown, is about at normal atmos-If the dimensions ofthe againstoneanotherand buckle, warp ,or.applyshearing forces on the securing means willbe avoided. The weight of eachplate should not be in excess of the strength of the securing means.

Furthermore, securing means other than weld metal-may be employed but,regardless of the .natureofthe securing means, the location of theJattershouldbe in the central part of each plate so. that expan'sionofthe plate in all directions may. take. place freely and without imposingany shearing. forces on the securing means.

-In'Figs. 4 and 5 an expansion joint for a lined conduit: embodying thepresent invention is illus- ,trated. In these figures the opposed endsI5 of adowncomer conduit 5 are connected by a seal .-l6-to prevent theescape of gases. Each conduit .end' [5 is lined withplates l'2 similarto those .shown in'Fig. 3,.and theseplates are attached to the conduitsby weld-metal; I3 near their. centers. "Within-the conduit ends a metalring I1 is iattached as by weld metal [8 at one end there- ;of,.to oneof the conduit. ends 15, extends past the seallB andhas a sliding fitwith the other conduit end. Thisyring is preferably equal in thicknesstothewear, plates. 12, so that its inner surface is v.flushwith plates'l2 of the conduit .-ends"-.l5. This ring I! is provided with a row of:wear; plates 19 atitsends and with plates I2 be- 45 wtween those rows.'a-plates 12 except that they are somewhat longer, aretattached'to ringH. as by weld metal 20,. and soverlapthe. plates i2which are attached tothe .conduit end -l5 at eachend of ring 11. Itwill be understood fromthe foregoing description that Theseplates 19 are similar to whentherighthand conduit end 15 moves axially relative to the lefthand conduitend to which the ring llis attached, the wear plates on the right- .handconduit end will slide on the outside of plates I 9 attached to ring l1.In this manner the expansion joint is permitted to function while Havingthus described the invention so that 4 othersskilled in the art may beable to understand and practice the same, we state that what .we desireto secure by Letters Patent is defined in arranged edge to edge on theinner surfaces of the conduit sections and ring with expansion spacesbetween the edges of adjacent plates, the platesat the ends of said ringoverlapping the :plates on the conduit ends, and a singleconnectionbetween the center part of each plate and the metal conduit.

2. A'conduit for blast furnace gases carrying abrasive solids comprisinga rigid, imperiorate metal shell and a sectional liner. for said shell,said liner consisting of a plurality of thin metal plates arranged withside surfaces against the inner surface of said shell and with expansionspaces-between edges of adjacent plates, and weld metal extending thruand filling holes provided.

therefor in said plates at their central points,

said weld metal constituting the sole means for supporting andconnecting the plates to the shell.

FRANK H. JANECEK. LEONARD LARSON. REFERENCES CITED The followingreferences are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 529,990 Wyckoif et a1 Nov. 2'7,1894 735,644 Wirtz Aug. 4, 1903 789,948 Williams May 16, 1905 814,949Edgar Mar. 13, 1906 936,308 Cook Oct. 12,1909 1,675,316 Russell June 26,1928 1,710,577 Hahn Apr. 23, 1929' 1,827,727 Blizard Oct. 20, 19311,843,790 Snow et al Feb. 2, 1932 1,900,006 Bailey Mar. 7, 19331,982,307 'Kahn Nov. 27, 1934 1,987,372 Schellhammer Jan. 8, 19351,995,216 Morrow Mar. 19, 1935 2,079,982 Belohlavek May 11, 1937 FOREIGNPATENTS Number Country Date 488,913 Great Britain July 15, 1938 734,968France Aug. 13, 1932 191,911 Switzerland July 15, 1937

